Answered on Oct 11th, 2017 at 8:20 AM
No, it is not legal for a party to alter a signed contract and try to make it appear as if the other party had agreed to it. I am not familiar with California procedure, but basically you need to, as soon as possible, start a proceeding against the forging party and your landlord, and obtain a preliminary injunction to prevent your eviction. You should probably consult a California attorney. If you can't afford one, speak to your local legal aid office or bar association.